For the 2SK3411 transistor, this 32.0 KB PDF provides the component reference, even though the index files it as a schematic. 2SK in the JEITA system denotes an N-channel FET, typically a MOSFET in switching or power circuits. Open it in any PDF viewer to check the pin diagram, maximum drain-source voltage, current rating and package before desoldering or substituting. Always match the part marking and package on the PCB to the sheet, since similar numbers can differ widely.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.